This is a new creation from the guys at UFC, they have been testing out different internal bell diameters to suit the FS clutch shoe and they believe to have found improvements running a 53.30mm ID which extremely thick and thermally stable walls to the bell!
 
Note: This bell is designed for Blackbone gear fitment only and for use with FS clutch shoes
 
Weve watched their testing videos and strongly approve, so we are proud to stock this product.